Help, Google's giving my alternate ads page a PR

and I can't stop it :-(

[Macro]

I don't link to that Alternate Ads page from any page on any site.

If I do a link:http://www.mysite.com/my-Alternate-Ads-Page.htm I get a listing of several pages on my site that have the Adsense ads, but which pages DON'T link to the Alternate Ads page (except when Google serves the Alternate Ads page as an SSI)

If I block the alternate ads page in robots.txt then I "lose" the PR i.e. there will be a PR leak out of the site (and it's a pretty high PR too). Google will see several links to a page that it is blocked from crawling. So PR that should be going to that page will be lost (I don't believe it gets redistributed to other pages on my site, please correct me if I'm wrong)

But Google shouldn't be crawling that page anyway! How did it get to that page? And how can I stop this? Thanks in advance for any suggestions.

[Macro]

I just noticed that the URL for my alternate ad page is in the Adsense code:
google_alternate_ad_url = "http://www.mysite.com/adsense_alternate.htm";

But that's in javascript and Google just reads URLs in js but doesn't actually follow those links! Or has that changed?

[floridasun]

My alternative ads page is an 'orphan' other than through the AdSense code, yet it has PR7, the same as my top site pages.

[jomaxx]

Why would it read URL's within Javascript if it didn't follow them?

I've never been sure whether PR can be passed through a URL that was identified but not explicitly linked by an HTML tag. If this is "real" PR and not a guess by the toolbar, then maybe it can.

[jomaxx]

BTW, you can explicitly exclude the alternate ad page in your robots.txt file. That should prevent this from happening.

[Macro]

you can explicitly exclude the alternate ad page in your robots.txt file

I did point that out in my original post. But there is an issue with that solution of using robots.txt ...

[jomaxx]

So you did. The "how can I stop this?" question threw me. Anyway, from my observations, pagerank does not leak away if you have sections of your site prohibited by the robots.txt.